Method of forming and using a bisphenol oil stream
Active Publication Date: 2018-11-08
SABIC GLOBAL TECH BV
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- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
The patent describes a method of making bisphenol A oil, which involves mixing molten bisphenol A with water to form a continuous stream. The resulting oil contains about 10-30% water and is at a temperature of 100-140°C. The oil is then flowed through an online densitometer to measure its density and temperature, allowing for the real-time concentration of the oil to be determined. This method can also be used to interfacially polymerize polycarbonate, where the reaction takes place by adding an oil mixture containing bisphenol A, water, a catalyst, and a carbonate compound to a reactor. During this process, the oil mixture is flowed through an online densitometer to measure its density and temperature, and the real-time concentration of the oil is determined. This helps to better control the polymerization process and produce high-quality polycarbonate.
Problems solved by technology
When producing the bisphenol A flakes or when otherwise handling bisphenol A flakes, a fine bisphenol dust is produced, which consists of high purity bisphenol A. The dust is tacky and difficult to handle and it can be difficult to determine a precise amount of bisphenol A being added to the reaction vessel.
Furthermore, handling this dust involves the risk of dust explosions.
For this reason, the bisphenol dust is usually disposed of and, for example, incinerated, which entails a costly manual handling procedure and extensive safety precautions due to the risk of dust explosions.
The disposal process has the disadvantages that at least a portion of the valuable raw material is being destroying and it has high handling costs.
Method used
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Effect test
example 1
etermination of Bisphenol A Oil Versus Water
[0032]Several bisphenol A oils were prepared with varying water content ranging from 14 to 32 wt % based on the total weight of the bisphenol A oil. The bisphenol A oils were prepared by heating bisphenol A having a purity of 99.5 wt % bisphenol A based on the total weight of the bisphenol A, to a temperature of 187° C. Water at a temperature of 61° C. was added to the bisphenol A with mixing. The density of the oils was determined at temperatures of 113 to 133° C. The density of the bisphenol A oil in cubic centimeters (cc) was then plotted versus the weight percent water, the density at 123° C. is illustrated in FIG. 5. A linear fit across the temperature range studied shows that the density=(−0.00201 times the weight percent of water)−(0.00044 times the temperature)+1.2035.
[0033]Set forth below are various non-limiting aspects of the present disclosure.
[0034]Aspect 1: A continuous method of forming a bisphenol A oil comprising: forming ...
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In an embodiment, a continuous method of forming a bisphenol A oil comprises forming the bisphenol A oil by mixing a molten bisphenol A and water; wherein the bisphenol A oil comprises 10 to 30 wt % water based on a total weight of the bisphenol A oil and is at a temperature of 100 to 140° C.; flowing at least a portion of the bisphenol A oil through an inline densitometer and measuring a real-time density and a real-time temperature of the bisphenol A oil; determining a real-time concentration of the bisphenol A oil based on said real-time density and said real-time temperature.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of European Application Serial No. 17169472 filed May 4, 2017. The related application is incorporated herein in its entirety by reference.BACKGROUND[0002]Interfacial polycarbonate plants currently use a complex system of flakers or prilling units, silos, transfer blowers, and diverter valves to deliver flaked bisphenol A to the reactor. For example, FIG. 1 illustrates post treatment process 10 currently used after the formation of bisphenol A involving the formation of a solid bisphenol A in a flaking unit. FIG. 1 illustrates that crystallized stream 32 is directed to phenol stripping unit 12 to form molten stream 42. Molten stream 42 is then solidified in a flaking unit 14. In flaking unit 14, the molten stream 42 is cooled below the freezing point of bisphenol A and the solidified bisphenol A is then scraped from the flaker drum to form flakes, which then drop into a receiver and are conveyed via flak...
Claims
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Login to View More IPC IPC(8): C08G64/24C08G64/20C08L69/00B01J8/00
CPCC08G64/24C08G64/205C08L69/00B01J8/0015B01J2219/0004B01J2219/00042C08G64/307C08G64/04
InventorBARO, KARL AARONGAUTAM, PANKAJ SINGH
OwnerSABIC GLOBAL TECH BV